5/13/15: There is widespread evidence that chemicals emitted by plants, known as phytoncides (wood essential oils), help strengthen the immune systems of humans who are exposed to them.1



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  1. “People Who Appreciate Nature Are Happier, Healthier And More Innovative” at http://elitedaily.com/life/people-who-appreciate-nature-are-happier-healthier-and-less-stressed/1024486/